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Re: endpoint liveness (RE: Do ATM-based Exchange Points make sense an ymore?)
On Fri, Aug 09, 2002 at 03:22:00PM -0700, Lane Patterson wrote: > BGP keepalive/hold timers are configurable even down to granularity of > link or PVC level keepalives, but for session stability reasons, it > appears that most ISPs at GigE exchanges choose not to tweak them down > from the defaults. IIRC, Juniper is 30/90 and Cisco is 60/180. My > gut feel was that even something like 10/30 would be reasonable, but > nobody seems compelled that this is much of an issue. Your Cisco router (say a GSR) will go foobar if you use 10/30 seconds timers, a IGP topology change, causing a new next-hop interface for 100k routes, will cause processes (probably CEF related) to run for so long, that you will loose your BGP keepalives, thus loose sessions, and everything will go *BOOM* - so please be nice and don't do that without real testing. /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Senior network engineer @ AS3292, TDC Tele Danmark One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.